If you're seeing gear oil where it definitely shouldn't be, this is usually one of the suspects. The PORC Off Road Products pinion oil seal is designed as a direct replacement for Jeep CJ and SJ models. This component installs at the pinion shaft and helps retain differential fluid while preventing leaks. Manufactured to align with factory specifications, it provides consistent fitment and straightforward installation during axle service. Replaces OE reference 998092N and interchange part number 16521.02.